1: thiophene-2-carboxylic acid With thionyl chloride T=100°C; 5 h; 2: With sodium azide; N-hexadecyl-N,N,N-trimethylammonium bromide in dichloromethane T=20°C; 18 h; 3: ethanol T=80°C; 4 h; Further stages.;

in tetrahydrofuran; dimethyl sulfoxide; toluene Reflux;

T=130°C; 1 h; Further byproducts given;

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MechanismProduct distribution;